FILTER OBTAINED BY INSCRIPTION OF A BRAGG GRATING IN AN OPTICAL FIBRE

摘要

the invention provides an optical filter formed bythe inclusion of at least one bragg grating not long (2)in an optical fiber.the filter is characterized in that the optical fibretapered to define two transition zones (z1, z3).a substantially adiabatic and intermediate zone(z2), the bragg grating (2) is not included in the longthe intermediate zone (z2) to produce a couplingcodirectionnel modes of core and sheath (lp01, lp02)at a wavelength which is a function of the network (2).